On 12/21/08 05:01, Bhasker C V wrote:
Ron Johnson wrote:
<div class="moz-text-flowed" style="font-family: -moz-fixed">(Please
don't top-post.)
On 12/20/08 18:18, Bhasker C V wrote:
Hi,
hdparm -r1 /dev/sda
works and I get this output when I read back the information with
plain '-r'
$ sudo hdparm -r /dev/sda
/dev/sda:
readonly = 1 (on)
Does this make it really read-only ?
That's what happens on my Firewire/SATA hard drive.
# hdparm -r1 /dev/sdc1
/dev/sdc1:
setting readonly to 1 (on)
readonly = 1 (on)
# mount -v /data/02
mount: block device /dev/sdc1 is write-protected, mounting read-only
/dev/sdc1 on /data/02 type ext3 (ro)
# dd count=10 if=/dev/hda1 of=/data/02/foo.bar
dd: opening `/data/02/foo.bar': Read-only file system
My harddisk is having a PV and then a VG ... LV which if i mount,
still is able to write to it ? [ VG activation is successful ]
(dont know if 'write' means really write a large file but I checked
using touch command and I am still able to create the file)
My kernel is 2.6.21.1
Is there anything I am missing here ?
Since you've got so many layers logicalness between the app and the
spindles, maybe you aren't really writing to the spindle you think you
are writing to? Or LVM is setting the read flag?
I tried this too ... But i am sure that the data is getting written to
be spindle. I deactivated the usb drive and then re-activated the VG and
LVs in it and could see the data writeen intact !
So, my guess is that hdparm -r1 does not work on USB scanned devices and
there is no method to make the device read-only [unless we try to stick
out head into the physical hardware ] ? Is that what we are concluding ?
Well, *you*, who are closer to the problem than I, are concluding it.
All I *know* is that "-r1" works on SCSI-over-Firewire and that it
apparently does not work on LVM over SCSI-over-USB. Unless you are
doing something "else" which seems so innocuous that you've failed
to mention it.
--
Ron Johnson, Jr.
Jefferson LA USA
I like my women like I like my coffee - purchased at above-market
rates from eco-friendly organic farming cooperatives in Latin America.
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